Natural variation of rice strigolactone biosynthesis is associated with the deletion of two
            <i>MAX1</i>
            orthologs

Cardoso, Catarina; Zhang, Yanxia; Jamil, Muhammad; Hepworth, Jo; Charnikhova, Tatsiana; Dimkpa, S. O. N; Meharg, Caroline; Wright, Mark H.; Liu, Jun-Wei; Meng, Xiangbing; Wang, Yonghong; Li, Jiayang; McCouch, Susan R.; Leyser, Ottoline; Price, Adam H.; Bouwmeester, Harro J.; Ruyter-Spira, Carolien

doi:10.1073/pnas.1317360111

Cited by 139 publications

(102 citation statements)

References 49 publications

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“…Another rice MAX1 homolog, Os1400, then converts ent-2′-epi-5-deoxystrigol into orobanchol . Rice has five MAX1 orthologs, of which fourOs900, Os1400, Os5100 and Os1900 -were shown to rescue the Arabidopsis max1 mutant phenotype (Challis et al 2013;Cardoso et al 2014). Although upon expression in Nicotiana benthamiana Os5100 and Os1900 catalysed the conversion of carlactone into ent-2′-epi-5-deoxystrigol (and minute amounts of 5-deoxystrigol), this occurred with very low efficiency, just as for Arabidopsis MAX1 .…”

Section: Sl Biosynthesis and Signallingmentioning

confidence: 99%

Ecological relevance of strigolactones in nutrient uptake and other abiotic stresses, and in plant-microbe interactions below-ground

Andreo-Jiménez¹,

Ruyter-Spira

Bouwmeester

et al. 2015

Plant Soil

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Background Plants are exposed to ever changing and often unfavourable environmental conditions, which cause both abiotic and biotic stresses. They have evolved sophisticated mechanisms to flexibly adapt themselves to these stress conditions. To achieve such adaptation, they need to control and coordinate physiological, developmental and defence responses. These responses are regulated through a complex network of interconnected signalling pathways, in which plant hormones play a key role. Strigolactones (SLs) are multifunctional molecules recently classified as a new class of phytohormones, playing a key role as modulators of the coordinated plant development in response to nutrient deficient conditions, especially phosphorus shortage. Belowground, besides regulating root architecture, they also act as molecular cues that help plants to communicate with their environment. Scope This review discusses current knowledge on the different roles of SLs below-ground, paying special attention to their involvement in phosphorus uptake by the plant by regulating root architecture and the establishment of mutualistic symbiosis with arbuscular mycorrhizal fungi. Their involvement in plant responses to other abiotic stresses such as drought and salinity, as well as in other plant-(micro)organisms interactions such as nodulation and root parasitic plants are also highlighted. Finally, the agronomical implications of SLs below-ground and their potential use in sustainable agriculture are addressed. Conclusions Experimental evidence illustrates the biological and ecological importance of SLs in the rhizosphere. Their multifunctional nature opens up a wide range of possibilities for potential applications in agriculture. However, a more in-depth understanding on the SL functioning/signalling mechanisms is required to allow us to exploit their full potential.

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Section: Sl Biosynthesis and Signallingmentioning

confidence: 99%

Ecological relevance of strigolactones in nutrient uptake and other abiotic stresses, and in plant-microbe interactions below-ground

Andreo-Jiménez¹,

Ruyter-Spira

Bouwmeester

et al. 2015

Plant Soil

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“…Among SL synthesis components, D27 encodes a β-carotene isomerase that converts all-trans-β-carotene into 9-cis-β-carotene (13,14). MAX3/RMS5/D17/DAD3 and MAX4/RMS1/D10/DAD1 encode the carotenoid cleavage dioxygenase 7 (CCD7) and CCD8, leading to the formation of carlactone, which is catalyzed further by MAX1/OsMAX1 to yield SL compounds (12,15,16). For the SL signaling components, MAX2/RMS4/D3 encodes an F-box protein participating in SL perception (17)(18)(19), D14/DAD2 encodes a protein of the α/β-fold hydrolase superfamily, a proposed SL receptor (20)(21)(22)(23)(24)(25), and D53 encodes a Clp protease family protein as a repressor (26,27).…”

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confidence: 99%

Strigolactones regulate rice tiller angle by attenuating shoot gravitropism through inhibiting auxin biosynthesis

Sang

Chen

Liu

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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137

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Tiller angle, a key agronomic trait for achieving ideal plant architecture and increasing grain yield, is regulated mainly by shoot gravitropism. Strigolactones (SLs) are a group of newly identified plant hormones that are essential for shoot branching/ rice tillering and have further biological functions as yet undetermined. Through screening for suppressors of lazy1 (sols), a classic rice mutant exhibiting large tiller angle and defective shoot gravitropism, we identified multiple SOLS that are involved in the SL biosynthetic or signaling pathway. We show that SL biosynthetic or signaling mutants can rescue the spreading phenotype of lazy1 (la1) and that SLs can inhibit auxin biosynthesis and attenuate rice shoot gravitropism, mainly by decreasing the local indoleacetic acid content. Although both SLs and LA1 are negative regulators of polar auxin transport, SLs do not alter the lateral auxin transport of shoot base, unlike LA1, which is a positive regulator of lateral auxin transport in rice. Genetic evidence demonstrates that SLs and LA1 participate in regulating shoot gravitropism and tiller angle in distinct genetic pathways. In addition, the SL-mediated shoot gravitropism is conserved in Arabidopsis. Our results disclose a new role of SLs and shed light on a previously unidentified mechanism underlying shoot gravitropism. Our study indicates that SLs could be considered as an important tool to achieve ideal plant architecture in the future. P lant shoot gravitropism is a process in which plants perceive gravity stimuli and reorient the direction of growth during the plant growth and development. Gravitropism is a dynamic process, including the perception of gravity, transduction of the corresponding information into a biochemical signal, transmission of the biochemical signal to a response site, and organ curvature (1). Genetic studies have disclosed that shoot endodermal cells act as statocytes for shoot gravitropism (2). Amyloplast sedimentation transduces the gravitropic signal and leads to auxin redistribution, resulting in a higher auxin level on the lower side than on the upper side (1, 3). Although auxin redistribution upon gravistimulation plays an important role in shoot gravitropism, the mechanism by which auxin regulates shoot gravitropism is not yet understood.In rice the tiller angle, which is defined as the angle between the tiller and main culm, plays a key role in determining rice plant architecture and thus grain yield (4). Several genes controlling the tiller angle have been identified previously in rice, including LAZY1 (LA1), TILLER ANGLE CONTROL1 (TAC1), PROSTRATE GROWTH1 (PROG1), and LOOSE PLANT ARCHITECTURE1 (LPA1) (5-9). Among these genes, LA1 and LPA1 are reported to regulate tiller angle through shoot gravitropism. In the la1 mutant, the polar auxin transport (PAT) is enhanced, and the lateral auxin transport is decreased, resulting in a disturbance of auxin asymmetric distribution in the shoot base and therefore the tiller-spreading phenotype of rice plants (5).Strigolactones (S...

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“…After the discovery of the first root-derived germination stimulants, Butler (1995) coined the name strigolactones (SLs) for these strigol-related compounds. So far, a variety of different SLs have been isolated from a range of plant species, and it has been shown that exudates contain more than one strigolactone and differences in the composition exist even between varieties of one species (Awad et al, 2006;Xie et al, 2010;Cardoso et al, 2014).…”

Section: Host Finding and Orientation: The Key Role Of Strigolactonesmentioning

confidence: 99%

Striga

Kountche

Al‐Babili

Haussmann

2016

Biotic Stress Resistance in Millets

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Natural variation of rice strigolactone biosynthesis is associated with the deletion of two MAX1 orthologs

Cited by 139 publications

References 49 publications

Ecological relevance of strigolactones in nutrient uptake and other abiotic stresses, and in plant-microbe interactions below-ground

Ecological relevance of strigolactones in nutrient uptake and other abiotic stresses, and in plant-microbe interactions below-ground

Strigolactones regulate rice tiller angle by attenuating shoot gravitropism through inhibiting auxin biosynthesis

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